oops right!!
thanks !!

I still have a little problem ....on my QDialog widget (I used the QDialog class instead of just QWidget, as proposed by Zlatomir)
I have a button to close it with the connection of the quit slot, but when I use it, my mainwindow closes at the same time, and I only want the QDialog widget to close...

Qt Code: 
  1. void mainwindow::ouvrir_dialogue()
  2. {
  3.     QDialog *dialogue = new QDialog(this);
  4.     dialogue->setModal(true);
  5.     QPalette pal = dialogue->palette(); 
  6.     pal.setColor(dialogue->backgroundRole(),Qt::white);         
  7.     dialogue->setPalette(pal);
  8.  
  9. .......................
  10. .........................
  11.  
  12.     QPushButton *bouton1 = new QPushButton("Enregistrer ");
  13.     QPushButton *bouton2 = new QPushButton("Terminer");
  14.  
  15.     ...........................
  16.  
  17.     dialogue->show();
  18.  
  19.      QObject::connect(bouton1, SIGNAL(clicked()), this, SLOT(save()));
  20.      QObject::connect(bouton2, SIGNAL(clicked()), qApp, SLOT(quit())); 
  21.  
  22. }
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